たい
わざ
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You have a great ability because your heart gives you the appearance of a superhuman. Your heart is really strong and powerful, fuelling your body to the best of its ability. All this together gives you the appearance of someone in top condition.
While you may have the appearance of someone who is super strong, powerful, and awesome, you do have one shortcoming. You don’t know how to tie (たい) a tie. Actually, you don’t even know how to tie your shoes, let alone your tie. How embarrassing.